package structs

import (
	"reflect"
	"testing"
	"time"

	"github.com/hashicorp/nomad/ci"
	"github.com/stretchr/testify/require"
)

// TestCSIVolumeClaim ensures that a volume claim workflows work as expected.
func TestCSIVolumeClaim(t *testing.T) {
	ci.Parallel(t)

	vol := NewCSIVolume("vol0", 0)
	vol.Schedulable = true
	vol.AccessMode = CSIVolumeAccessModeUnknown
	vol.AttachmentMode = CSIVolumeAttachmentModeUnknown
	vol.RequestedCapabilities = []*CSIVolumeCapability{
		{
			AccessMode:     CSIVolumeAccessModeMultiNodeSingleWriter,
			AttachmentMode: CSIVolumeAttachmentModeFilesystem,
		},
		{
			AccessMode:     CSIVolumeAccessModeMultiNodeReader,
			AttachmentMode: CSIVolumeAttachmentModeFilesystem,
		},
	}

	alloc1 := &Allocation{ID: "a1", Namespace: "n", JobID: "j"}
	alloc2 := &Allocation{ID: "a2", Namespace: "n", JobID: "j"}
	alloc3 := &Allocation{ID: "a3", Namespace: "n", JobID: "j3"}
	claim := &CSIVolumeClaim{
		AllocationID: alloc1.ID,
		NodeID:       "foo",
		State:        CSIVolumeClaimStateTaken,
	}

	// claim a read and ensure we are still schedulable
	claim.Mode = CSIVolumeClaimRead
	claim.AccessMode = CSIVolumeAccessModeMultiNodeReader
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem
	require.NoError(t, vol.Claim(claim, alloc1))
	require.True(t, vol.ReadSchedulable())
	require.False(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 2)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[1].AccessMode)

	// claim a write and ensure we can't upgrade capabilities.
	claim.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	claim.Mode = CSIVolumeClaimWrite
	claim.AllocationID = alloc2.ID
	require.EqualError(t, vol.Claim(claim, alloc2), ErrCSIVolumeUnschedulable.Error())
	require.True(t, vol.ReadSchedulable())
	require.False(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// release our last claim, including unpublish workflow
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	claim.State = CSIVolumeClaimStateReadyToFree
	vol.Claim(claim, nil)
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 2)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[1].AccessMode)

	// claim a write on the now-unclaimed volume and ensure we can upgrade
	// capabilities so long as they're in our RequestedCapabilities.
	claim.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	claim.Mode = CSIVolumeClaimWrite
	claim.State = CSIVolumeClaimStateTaken
	claim.AllocationID = alloc2.ID
	require.NoError(t, vol.Claim(claim, alloc2))
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 2)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[1].AccessMode)

	// make the claim again to ensure its idempotent, and that the volume's
	// access mode is unchanged.
	require.NoError(t, vol.Claim(claim, alloc2))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 1)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// claim a read. ensure we are still schedulable and that we haven't
	// changed the access mode
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	claim.AccessMode = CSIVolumeAccessModeMultiNodeReader
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem
	require.NoError(t, vol.Claim(claim, alloc1))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// ensure we can't change the attachment mode for a claimed volume
	claim.AttachmentMode = CSIVolumeAttachmentModeBlockDevice
	claim.AllocationID = alloc3.ID
	require.EqualError(t, vol.Claim(claim, alloc3),
		"cannot change attachment mode of claimed volume")
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem

	// denormalize-on-read (simulating a volume we've gotten out of the state
	// store) and then ensure we cannot claim another write
	vol.WriteAllocs[alloc2.ID] = alloc2
	claim.Mode = CSIVolumeClaimWrite
	require.EqualError(t, vol.Claim(claim, alloc3), ErrCSIVolumeMaxClaims.Error())

	// release the write claim but ensure it doesn't free up write claims
	// until after we've unpublished
	claim.AllocationID = alloc2.ID
	claim.State = CSIVolumeClaimStateUnpublishing
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1) // claim still exists until we're done
	require.Len(t, vol.PastClaims, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// complete the unpublish workflow
	claim.State = CSIVolumeClaimStateReadyToFree
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.True(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.WriteAllocs, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// release our last claim, including unpublish workflow
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	vol.Claim(claim, nil)
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 2)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[1].AccessMode)
}

// TestCSIVolumeClaim_CompatOldClaims ensures that volume created before
// v1.1.0 with claims that exist before v1.1.0 still work.
//
// COMPAT(1.3.0): safe to remove this test, but not the code, for 1.3.0
func TestCSIVolumeClaim_CompatOldClaims(t *testing.T) {
	ci.Parallel(t)

	vol := NewCSIVolume("vol0", 0)
	vol.Schedulable = true
	vol.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	vol.AttachmentMode = CSIVolumeAttachmentModeFilesystem

	alloc1 := &Allocation{ID: "a1", Namespace: "n", JobID: "j"}
	alloc2 := &Allocation{ID: "a2", Namespace: "n", JobID: "j"}
	alloc3 := &Allocation{ID: "a3", Namespace: "n", JobID: "j3"}
	claim := &CSIVolumeClaim{
		AllocationID: alloc1.ID,
		NodeID:       "foo",
		State:        CSIVolumeClaimStateTaken,
	}

	// claim a read and ensure we are still schedulable
	claim.Mode = CSIVolumeClaimRead
	require.NoError(t, vol.Claim(claim, alloc1))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.True(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)

	// claim a write and ensure we no longer have free write claims
	claim.Mode = CSIVolumeClaimWrite
	claim.AllocationID = alloc2.ID
	require.NoError(t, vol.Claim(claim, alloc2))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// denormalize-on-read (simulating a volume we've gotten out of the state
	// store) and then ensure we cannot claim another write
	vol.WriteAllocs[alloc2.ID] = alloc2
	claim.AllocationID = alloc3.ID
	require.EqualError(t, vol.Claim(claim, alloc3), ErrCSIVolumeMaxClaims.Error())

	// release the write claim but ensure it doesn't free up write claims
	// until after we've unpublished
	claim.AllocationID = alloc2.ID
	claim.State = CSIVolumeClaimStateUnpublishing
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1) // claim still exists until we're done
	require.Len(t, vol.PastClaims, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// complete the unpublish workflow
	claim.State = CSIVolumeClaimStateReadyToFree
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.True(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.WriteAllocs, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// release our last claim, including unpublish workflow
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	vol.Claim(claim, nil)
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)
}

// TestCSIVolumeClaim_CompatNewClaimsOK ensures that a volume created
// before v1.1.0 is compatible with new claims.
//
// COMPAT(1.3.0): safe to remove this test, but not the code, for 1.3.0
func TestCSIVolumeClaim_CompatNewClaimsOK(t *testing.T) {
	ci.Parallel(t)

	vol := NewCSIVolume("vol0", 0)
	vol.Schedulable = true
	vol.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	vol.AttachmentMode = CSIVolumeAttachmentModeFilesystem

	alloc1 := &Allocation{ID: "a1", Namespace: "n", JobID: "j"}
	alloc2 := &Allocation{ID: "a2", Namespace: "n", JobID: "j"}
	alloc3 := &Allocation{ID: "a3", Namespace: "n", JobID: "j3"}
	claim := &CSIVolumeClaim{
		AllocationID: alloc1.ID,
		NodeID:       "foo",
		State:        CSIVolumeClaimStateTaken,
	}

	// claim a read and ensure we are still schedulable
	claim.Mode = CSIVolumeClaimRead
	claim.AccessMode = CSIVolumeAccessModeMultiNodeReader
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem
	require.NoError(t, vol.Claim(claim, alloc1))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.True(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)

	// claim a write and ensure we no longer have free write claims
	claim.Mode = CSIVolumeClaimWrite
	claim.AllocationID = alloc2.ID
	require.NoError(t, vol.Claim(claim, alloc2))
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// ensure we can't change the attachment mode for a claimed volume
	claim.AttachmentMode = CSIVolumeAttachmentModeBlockDevice
	require.EqualError(t, vol.Claim(claim, alloc2),
		"cannot change attachment mode of claimed volume")
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem

	// denormalize-on-read (simulating a volume we've gotten out of the state
	// store) and then ensure we cannot claim another write
	vol.WriteAllocs[alloc2.ID] = alloc2
	claim.AllocationID = alloc3.ID
	require.EqualError(t, vol.Claim(claim, alloc3), ErrCSIVolumeMaxClaims.Error())

	// release the write claim but ensure it doesn't free up write claims
	// until after we've unpublished
	claim.AllocationID = alloc2.ID
	claim.State = CSIVolumeClaimStateUnpublishing
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 1) // claim still exists until we're done
	require.Len(t, vol.PastClaims, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// complete the unpublish workflow
	claim.State = CSIVolumeClaimStateReadyToFree
	vol.Claim(claim, nil)
	require.True(t, vol.ReadSchedulable())
	require.True(t, vol.WriteSchedulable())
	require.True(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.WriteAllocs, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)

	// release our last claim, including unpublish workflow
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	vol.Claim(claim, nil)
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeSingleWriter,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)
}

// TestCSIVolumeClaim_CompatNewClaimsNoUpgrade ensures that a volume created
// before v1.1.0 is compatible with new claims, but prevents unexpected
// capability upgrades.
//
// COMPAT(1.3.0): safe to remove this test, but not the code, for 1.3.0
func TestCSIVolumeClaim_CompatNewClaimsNoUpgrade(t *testing.T) {
	ci.Parallel(t)

	vol := NewCSIVolume("vol0", 0)
	vol.Schedulable = true
	vol.AccessMode = CSIVolumeAccessModeMultiNodeReader
	vol.AttachmentMode = CSIVolumeAttachmentModeFilesystem

	alloc1 := &Allocation{ID: "a1", Namespace: "n", JobID: "j"}
	alloc2 := &Allocation{ID: "a2", Namespace: "n", JobID: "j"}
	claim := &CSIVolumeClaim{
		AllocationID: alloc1.ID,
		NodeID:       "foo",
		State:        CSIVolumeClaimStateTaken,
	}

	// claim a read and ensure we are still schedulable
	claim.Mode = CSIVolumeClaimRead
	claim.AccessMode = CSIVolumeAccessModeMultiNodeReader
	claim.AttachmentMode = CSIVolumeAttachmentModeFilesystem
	require.NoError(t, vol.Claim(claim, alloc1))
	require.True(t, vol.ReadSchedulable())
	require.False(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)

	// claim a write and ensure we can't upgrade capabilities.
	claim.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	claim.Mode = CSIVolumeClaimWrite
	claim.AllocationID = alloc2.ID
	require.EqualError(t, vol.Claim(claim, alloc2), ErrCSIVolumeUnschedulable.Error())
	require.True(t, vol.ReadSchedulable())
	require.False(t, vol.WriteSchedulable())
	require.False(t, vol.HasFreeWriteClaims())
	require.Len(t, vol.ReadClaims, 1)
	require.Len(t, vol.WriteClaims, 0)
	require.Len(t, vol.PastClaims, 0)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem, vol.AttachmentMode)
	require.Len(t, vol.RequestedCapabilities, 1)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)

	// release our last claim, including unpublish workflow
	claim.AllocationID = alloc1.ID
	claim.Mode = CSIVolumeClaimRead
	claim.State = CSIVolumeClaimStateReadyToFree
	vol.Claim(claim, nil)
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)

	// claim a write on the now-unclaimed volume and ensure we still can't
	// upgrade capabilities.
	claim.AccessMode = CSIVolumeAccessModeMultiNodeSingleWriter
	claim.Mode = CSIVolumeClaimWrite
	claim.State = CSIVolumeClaimStateTaken
	claim.AllocationID = alloc2.ID
	require.EqualError(t, vol.Claim(claim, alloc2), ErrCSIVolumeUnschedulable.Error())
	require.Len(t, vol.ReadClaims, 0)
	require.Len(t, vol.WriteClaims, 0)
	require.Equal(t, CSIVolumeAccessModeUnknown, vol.AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeUnknown, vol.AttachmentMode)
	require.Equal(t, CSIVolumeAccessModeMultiNodeReader,
		vol.RequestedCapabilities[0].AccessMode)
	require.Equal(t, CSIVolumeAttachmentModeFilesystem,
		vol.RequestedCapabilities[0].AttachmentMode)
}

func TestVolume_Copy(t *testing.T) {
	ci.Parallel(t)

	a1 := MockAlloc()
	a2 := MockAlloc()
	a3 := MockAlloc()
	c1 := &CSIVolumeClaim{
		AllocationID:   a1.ID,
		NodeID:         a1.NodeID,
		ExternalNodeID: "c1",
		Mode:           CSIVolumeClaimRead,
		State:          CSIVolumeClaimStateTaken,
	}
	c2 := &CSIVolumeClaim{
		AllocationID:   a2.ID,
		NodeID:         a2.NodeID,
		ExternalNodeID: "c2",
		Mode:           CSIVolumeClaimRead,
		State:          CSIVolumeClaimStateNodeDetached,
	}
	c3 := &CSIVolumeClaim{
		AllocationID:   a3.ID,
		NodeID:         a3.NodeID,
		ExternalNodeID: "c3",
		Mode:           CSIVolumeClaimWrite,
		State:          CSIVolumeClaimStateTaken,
	}

	v1 := &CSIVolume{
		ID:             "vol1",
		Name:           "vol1",
		ExternalID:     "vol-abcdef",
		Namespace:      "default",
		Topologies:     []*CSITopology{{Segments: map[string]string{"AZ1": "123"}}},
		AccessMode:     CSIVolumeAccessModeSingleNodeWriter,
		AttachmentMode: CSIVolumeAttachmentModeBlockDevice,
		MountOptions:   &CSIMountOptions{FSType: "ext4", MountFlags: []string{"ro", "noatime"}},
		Secrets:        CSISecrets{"mysecret": "myvalue"},
		Parameters:     map[string]string{"param1": "val1"},
		Context:        map[string]string{"ctx1": "val1"},

		ReadAllocs:  map[string]*Allocation{a1.ID: a1, a2.ID: nil},
		WriteAllocs: map[string]*Allocation{a3.ID: a3},

		ReadClaims:  map[string]*CSIVolumeClaim{a1.ID: c1, a2.ID: c2},
		WriteClaims: map[string]*CSIVolumeClaim{a3.ID: c3},
		PastClaims:  map[string]*CSIVolumeClaim{},

		Schedulable:         true,
		PluginID:            "moosefs",
		Provider:            "n/a",
		ProviderVersion:     "1.0",
		ControllerRequired:  true,
		ControllersHealthy:  2,
		ControllersExpected: 2,
		NodesHealthy:        4,
		NodesExpected:       5,
		ResourceExhausted:   time.Now(),
	}

	v2 := v1.Copy()
	if !reflect.DeepEqual(v1, v2) {
		t.Fatalf("Copy() returned an unequal Volume; got %#v; want %#v", v1, v2)
	}

	v1.ReadClaims[a1.ID].State = CSIVolumeClaimStateReadyToFree
	v1.ReadAllocs[a2.ID] = a2
	v1.WriteAllocs[a3.ID].ClientStatus = AllocClientStatusComplete
	v1.MountOptions.FSType = "zfs"

	if v2.ReadClaims[a1.ID].State == CSIVolumeClaimStateReadyToFree {
		t.Fatalf("Volume.Copy() failed; changes to original ReadClaims seen in copy")
	}
	if v2.ReadAllocs[a2.ID] != nil {
		t.Fatalf("Volume.Copy() failed; changes to original ReadAllocs seen in copy")
	}
	if v2.WriteAllocs[a3.ID].ClientStatus == AllocClientStatusComplete {
		t.Fatalf("Volume.Copy() failed; changes to original WriteAllocs seen in copy")
	}
	if v2.MountOptions.FSType == "zfs" {
		t.Fatalf("Volume.Copy() failed; changes to original MountOptions seen in copy")
	}

}

func TestCSIVolume_Validate(t *testing.T) {
	ci.Parallel(t)

	vol := &CSIVolume{
		ID:         "test",
		PluginID:   "test",
		SnapshotID: "test-snapshot",
		CloneID:    "test-clone",
		RequestedTopologies: &CSITopologyRequest{
			Required: []*CSITopology{{}, {}},
		},
	}
	err := vol.Validate()
	require.EqualError(t, err, "validation: missing namespace, only one of snapshot_id and clone_id is allowed, must include at least one capability block, required topology is missing segments field, required topology is missing segments field")

}

func TestCSIVolume_Merge(t *testing.T) {
	ci.Parallel(t)

	testCases := []struct {
		name     string
		v        *CSIVolume
		update   *CSIVolume
		expected string
		expectFn func(t *testing.T, v *CSIVolume)
	}{
		{
			name: "invalid capacity update",
			v:    &CSIVolume{Capacity: 100},
			update: &CSIVolume{
				RequestedCapacityMax: 300, RequestedCapacityMin: 200},
			expected: "volume requested capacity update was not compatible with existing capacity",
			expectFn: func(t *testing.T, v *CSIVolume) {
				require.NotEqual(t, 300, v.RequestedCapacityMax)
				require.NotEqual(t, 200, v.RequestedCapacityMin)
			},
		},
		{
			name: "invalid capability update",
			v: &CSIVolume{
				AccessMode:     CSIVolumeAccessModeMultiNodeReader,
				AttachmentMode: CSIVolumeAttachmentModeFilesystem,
			},
			update: &CSIVolume{
				RequestedCapabilities: []*CSIVolumeCapability{
					{
						AccessMode:     CSIVolumeAccessModeSingleNodeWriter,
						AttachmentMode: CSIVolumeAttachmentModeFilesystem,
					},
				},
			},
			expected: "volume requested capabilities update was not compatible with existing capability in use",
		},
		{
			name: "invalid topology update - removed",
			v: &CSIVolume{
				RequestedTopologies: &CSITopologyRequest{
					Required: []*CSITopology{
						{Segments: map[string]string{"rack": "R1"}},
					},
				},
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
				},
			},
			update:   &CSIVolume{},
			expected: "volume topology request update was not compatible with existing topology",
			expectFn: func(t *testing.T, v *CSIVolume) {
				require.Len(t, v.Topologies, 1)
			},
		},
		{
			name: "invalid topology requirement added",
			v: &CSIVolume{
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
				},
			},
			update: &CSIVolume{
				RequestedTopologies: &CSITopologyRequest{
					Required: []*CSITopology{
						{Segments: map[string]string{"rack": "R1"}},
						{Segments: map[string]string{"rack": "R3"}},
					},
				},
			},
			expected: "volume topology request update was not compatible with existing topology",
			expectFn: func(t *testing.T, v *CSIVolume) {
				require.Len(t, v.Topologies, 1)
				require.Equal(t, "R1", v.Topologies[0].Segments["rack"])
			},
		},
		{
			name: "invalid topology preference removed",
			v: &CSIVolume{
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
				},
				RequestedTopologies: &CSITopologyRequest{
					Preferred: []*CSITopology{
						{Segments: map[string]string{"rack": "R1"}},
						{Segments: map[string]string{"rack": "R3"}},
					},
				},
			},
			update: &CSIVolume{
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
				},
				RequestedTopologies: &CSITopologyRequest{
					Preferred: []*CSITopology{
						{Segments: map[string]string{"rack": "R3"}},
					},
				},
			},
			expected: "volume topology request update was not compatible with existing topology",
		},
		{
			name: "valid update",
			v: &CSIVolume{
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
					{Segments: map[string]string{"rack": "R2"}},
				},
				AccessMode:     CSIVolumeAccessModeMultiNodeReader,
				AttachmentMode: CSIVolumeAttachmentModeFilesystem,
				MountOptions: &CSIMountOptions{
					FSType:     "ext4",
					MountFlags: []string{"noatime"},
				},
				RequestedTopologies: &CSITopologyRequest{
					Required: []*CSITopology{
						{Segments: map[string]string{"rack": "R1"}},
					},
					Preferred: []*CSITopology{
						{Segments: map[string]string{"rack": "R2"}},
					},
				},
			},
			update: &CSIVolume{
				Topologies: []*CSITopology{
					{Segments: map[string]string{"rack": "R1"}},
					{Segments: map[string]string{"rack": "R2"}},
				},
				MountOptions: &CSIMountOptions{
					FSType:     "ext4",
					MountFlags: []string{"noatime"},
				},
				RequestedTopologies: &CSITopologyRequest{
					Required: []*CSITopology{
						{Segments: map[string]string{"rack": "R1"}},
					},
					Preferred: []*CSITopology{
						{Segments: map[string]string{"rack": "R2"}},
					},
				},
				RequestedCapabilities: []*CSIVolumeCapability{
					{
						AccessMode:     CSIVolumeAccessModeMultiNodeReader,
						AttachmentMode: CSIVolumeAttachmentModeFilesystem,
					},
					{
						AccessMode:     CSIVolumeAccessModeMultiNodeReader,
						AttachmentMode: CSIVolumeAttachmentModeFilesystem,
					},
				},
			},
		},
	}
	for _, tc := range testCases {
		tc = tc
		t.Run(tc.name, func(t *testing.T) {
			err := tc.v.Merge(tc.update)
			if tc.expected == "" {
				require.NoError(t, err)
			} else {
				if tc.expectFn != nil {
					tc.expectFn(t, tc.v)
				}
				require.Error(t, err, tc.expected)
				require.Contains(t, err.Error(), tc.expected)
			}
		})
	}
}

func TestCSIPluginJobs(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)
	controller := &Job{
		ID:   "job",
		Type: "service",
		TaskGroups: []*TaskGroup{{
			Name:  "foo",
			Count: 11,
			Tasks: []*Task{{
				CSIPluginConfig: &TaskCSIPluginConfig{
					ID:   "foo",
					Type: CSIPluginTypeController,
				},
			}},
		}},
	}

	summary := &JobSummary{}

	plug.AddJob(controller, summary)
	require.Equal(t, 11, plug.ControllersExpected)

	// New job id & make it a system node plugin job
	node := controller.Copy()
	node.ID = "bar"
	node.Type = "system"
	node.TaskGroups[0].Tasks[0].CSIPluginConfig.Type = CSIPluginTypeNode

	summary = &JobSummary{
		Summary: map[string]TaskGroupSummary{
			"foo": {
				Queued:   1,
				Running:  1,
				Starting: 1,
			},
		},
	}

	plug.AddJob(node, summary)
	require.Equal(t, 3, plug.NodesExpected)

	plug.DeleteJob(node, summary)
	require.Equal(t, 0, plug.NodesExpected)
	require.Empty(t, plug.NodeJobs[""])

	plug.DeleteJob(controller, nil)
	require.Equal(t, 0, plug.ControllersExpected)
	require.Empty(t, plug.ControllerJobs[""])
}

func TestCSIPluginCleanup(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)
	plug.AddPlugin("n0", &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		ControllerInfo:           &CSIControllerInfo{},
	})

	plug.AddPlugin("n0", &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		NodeInfo:                 &CSINodeInfo{},
	})

	require.Equal(t, 1, plug.ControllersHealthy)
	require.Equal(t, 1, plug.NodesHealthy)

	err := plug.DeleteNode("n0")
	require.NoError(t, err)

	require.Equal(t, 0, plug.ControllersHealthy)
	require.Equal(t, 0, plug.NodesHealthy)

	require.Equal(t, 0, len(plug.Controllers))
	require.Equal(t, 0, len(plug.Nodes))
}

func TestDeleteNodeForType_Controller(t *testing.T) {
	ci.Parallel(t)

	info := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		ControllerInfo:           &CSIControllerInfo{},
	}

	plug := NewCSIPlugin("foo", 1000)

	plug.Controllers["n0"] = info
	plug.ControllersHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeController)
	require.NoError(t, err)

	require.Equal(t, 0, plug.ControllersHealthy)
	require.Equal(t, 0, len(plug.Controllers))
}

func TestDeleteNodeForType_NilController(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)

	plug.Controllers["n0"] = nil
	plug.ControllersHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeController)
	require.Error(t, err)
	require.Equal(t, 1, len(plug.Controllers))

	_, ok := plug.Controllers["foo"]
	require.False(t, ok)
}

func TestDeleteNodeForType_Node(t *testing.T) {
	ci.Parallel(t)

	info := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		NodeInfo:                 &CSINodeInfo{},
	}

	plug := NewCSIPlugin("foo", 1000)

	plug.Nodes["n0"] = info
	plug.NodesHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeNode)
	require.NoError(t, err)

	require.Equal(t, 0, plug.NodesHealthy)
	require.Equal(t, 0, len(plug.Nodes))
}

func TestDeleteNodeForType_NilNode(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)

	plug.Nodes["n0"] = nil
	plug.NodesHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeNode)
	require.Error(t, err)
	require.Equal(t, 1, len(plug.Nodes))

	_, ok := plug.Nodes["foo"]
	require.False(t, ok)
}

func TestDeleteNodeForType_Monolith(t *testing.T) {
	ci.Parallel(t)

	controllerInfo := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		ControllerInfo:           &CSIControllerInfo{},
	}

	nodeInfo := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		NodeInfo:                 &CSINodeInfo{},
	}

	plug := NewCSIPlugin("foo", 1000)

	plug.Controllers["n0"] = controllerInfo
	plug.ControllersHealthy = 1

	plug.Nodes["n0"] = nodeInfo
	plug.NodesHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeMonolith)
	require.NoError(t, err)

	require.Equal(t, 0, len(plug.Controllers))
	require.Equal(t, 0, len(plug.Nodes))

	_, ok := plug.Nodes["foo"]
	require.False(t, ok)

	_, ok = plug.Controllers["foo"]
	require.False(t, ok)
}

func TestDeleteNodeForType_Monolith_NilController(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)

	plug.Controllers["n0"] = nil
	plug.ControllersHealthy = 1

	nodeInfo := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		NodeInfo:                 &CSINodeInfo{},
	}

	plug.Nodes["n0"] = nodeInfo
	plug.NodesHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeMonolith)
	require.Error(t, err)

	require.Equal(t, 1, len(plug.Controllers))
	require.Equal(t, 0, len(plug.Nodes))

	_, ok := plug.Nodes["foo"]
	require.False(t, ok)

	_, ok = plug.Controllers["foo"]
	require.False(t, ok)
}

func TestDeleteNodeForType_Monolith_NilNode(t *testing.T) {
	ci.Parallel(t)

	plug := NewCSIPlugin("foo", 1000)

	plug.Nodes["n0"] = nil
	plug.NodesHealthy = 1

	controllerInfo := &CSIInfo{
		PluginID:                 "foo",
		AllocID:                  "a0",
		Healthy:                  true,
		Provider:                 "foo-provider",
		RequiresControllerPlugin: true,
		RequiresTopologies:       false,
		ControllerInfo:           &CSIControllerInfo{},
	}

	plug.Controllers["n0"] = controllerInfo
	plug.ControllersHealthy = 1

	err := plug.DeleteNodeForType("n0", CSIPluginTypeMonolith)
	require.Error(t, err)

	require.Equal(t, 0, len(plug.Controllers))
	require.Equal(t, 1, len(plug.Nodes))

	_, ok := plug.Nodes["foo"]
	require.False(t, ok)

	_, ok = plug.Controllers["foo"]
	require.False(t, ok)
}